Siemens Simatic SM331 Getting Started page 15

In our example, a sensor with a 4 to 20mA 2-wire transducer is connected
to channel group 1 at input 0.
A 4-wire transducer is connected to channel group 2 at inputs 2 and 3.
Therefore, the first measuring range module should have Position D and
the second should have Position C
Table 4-4 Positioning of the measuring range modules
Graphics
Note
When you use a 2-wire transducer, the electrical isolation against the load voltage
is lost for all the channels in the module (at least one measuring range module is
set to position D)
13
Description
With a screwdriver, pull out the two measur-
ing range modules
Turn the measuring range module to the
desired position:
Plug the measuring range module back into
the module
In our example, the module should have the
following positions:
CH0,1: D
CH2,3: C
Getting Started SM331 AI 8x12bit Part1: 4-20mA
A5E00253410